Whenever I feel like I can't clip in, out comes the White Lightening. It's about once a month. Never had an issue with clipping out. I also have the x2's. I'm thinking of getting frogs for my mtb. I am a little scared to give up the flat pedal on one side, but I never clip in to the spds because 1) they feel so hard to get into compared to the speedplays 2) they hurt my knees 3) I can barely get out of them, even though they are on the loosest tension. I rode spds on my road bike for about a year and a half and never had issues then, but I think switching back and forth is bad for the muscle memory. As long as I can get out quickly on my mtb, i should be OK.